What USB should I use for BIOS update?
You should use it as long as it's a USB 2.0 stick. However, you need to ensure you are formatting your USB into FAT32 format to be able to use it in your BIOS/UEFI.
Can I update a BIOS without a USB?
It depends on the type of motherboard you have. You can update the BIOS without needing a USB pen drive if you have a UEFI motherboard. However, you must check your manufacturer's guide on updating the BIOS.
¿Necesito obligatoriamente otro ordenador para arreglar la BIOS?
Videos
So recently I started pc after a long time and it bsod after 10 mins and didn't boot with message "insert boot media and press enter" and my ssd wasn't getting detected in bios so in a moment of stupidity I enabled fast boot like it was gonna do some magical shit. Now post screen is skipped because of that and I can't enter into bios. Since keyboard is activated on post screen, keyboard is dead as well.
What are the possible workarounds to get into bios or reset bios so I can get my bootable usb running to repair windows?
Cpu : 3700x
Gpu : RX 5700
MB : x570 aorus elite wifi